Hearing, from sensory processing to perception by B Kollmeier(
Book
)13
editions published
in
2007
in
English
and held by
72 WorldCat member
libraries
worldwide
Hearing??? From Sensory Processing to Perception presents the papers of the latest???International Symposium on Hearing???,
a meeting held every three years focusing on psychoacoustics and the research of the physiological mechanisms underlying auditory
perception. The proceedings provide an up-to-date report on the status of the field of research into hearing and auditory
functions. The 59 chapters treat topics such as: the physiological representation of temporal and spectral stimulus properties
as a basis for the perception of modulation patterns, pitch and signal intensity; spatial heari

A microscopic model of speech recognition for listeners with normal and impaired hearing by Tim Jürgens(
)2
editions published
in
2010
in
English
and held by
2 WorldCat member
libraries
worldwide
This dissertation presents a microscopic model of human speech recognition (HSR), microscopic in a sense that first, the recognition
of single phonemes rather than the recognition of whole sentences is modeled. Second, the particular spectro-temporal structure
of speech is processed by an auditory model. This contrasts with other models of HSR, which usually use the spectral structure
only. The model is capable of predicting phoneme recognition in normal-hearing (NH) listeners in noise along with important
aspects of consonant recognition in quiet. Furthermore, this model is extended for the prediction of sentence recognition.
The extension is capable of predicting speech recognition of NH and hearing-impaired (HI) listeners as accurately as a standard
speech intelligibility model. Parameters reflecting the supra-threshold auditory processing are assessed in NH and HI listeners
using psychoacoustical techniques such as forward masking and categorical loudness scaling. These supra-threshold auditory
processing deficits are included in the model and the results show that implementing supra-threshold processing improves prediction
accuracy. <engl.>

An effective binaural processing model based on interaural phase differences by Mathias Dietz(
)2
editions published
in
2009
in
English
and held by
2 WorldCat member
libraries
worldwide
Humans have the ability to blindly localize sound sources. In a babble of concurrent talkers they can focus on one specific
talker and understand his or her speech. One important reason for this is the ability of the human auditory system to estimate
interaural differences by comparing signals from the left and the right ear. Differences between the ears exist in either
timing or level. The standard model for time difference detection from Jeffress (1948) is based on an internal cross-correlator
with two counterdirective chains of delay elements. In contrast recent neurophysiologic but also psychoacoustic studies indicate
that chains of delay elements do not exist in mammals. In this thesis an effective binaural processing model is presented
which is based on instantaneous phase comparison instead of delay compensation. An effective model is a chain of signal processing
elements, with the philosophy not to model a specific neural realization but rather to quantify the transmitted information.
<engl.>

Auditory spectro-temporal processing in the envelope frequency domain experiments and models by Stephan Ewert(
)1
edition published
in
2002
in
English
and held by
2 WorldCat member
libraries
worldwide
This thesis investigates the processing of the envelope of sounds in the human auditory system. Psychoacoustic methods are
used to examine the i) envelope-frequency selectivity, ii) coding of amplitude-modulation depth, and the iii) analysis of
complex modulations. A functional model of hearing is proposed that successfully accounts for the empirical data. Chapter
1 derives the bandwidth and the shape of auditory modulation filters in terms of a critical-band concept in the envelope-frequency
domain. Chapter 2 addresses the role of internal and external limitations in amplitude-modulation detection and discrimination.
In Chapter 3, the role of beats between modulations (venelope fluctuations) in modulation-masking experiments is examined.
Chapter 4 further investigates the processes underlying the extraction of the venelope in the normal-hearing and sensorineural
hearing-impaired auditory system. Chapter 5 shows that the frequency selectivity in the envelope-frequency domain reflects
a 'true' limited-resolution spectral decomposition, and not a selective process tuned to different repetition rates of the
envelope. <engl.>

Objective audiological diagnostics using novel acoustical and electrophysiological tests by Matthias Müller-Wehlau(
)2
editions published
in
2011
in
English
and held by
1 WorldCat member
library
worldwide
In this thesis different acoustical and electrophysiological approaches for the objective audiological diagnostic are investigated.
The utilized methods involve higher stages of the audiometric pathway and therefore allow the assessment of the state of hearing
up to neural levels. It was shown that a different method to measure the acoustic reflex elicitation in conjunction with a
new robust detection algorithm allows a significantly reduced stimulus level and higher detection rates compared to the established
method. The same method was used to correlate reflex thresholds with the loss of cochlear compression that results from sensorineural
hearing loss thus offering an objective method to estimate the broadband hearing threshold. Yet another method connects objective
measurements of amplitude modulation following responses (AMFR) with differences in modulation depths perception due to cochlear
damage. <engl.>

Psychoacoustics, Speech and Hearing Aids Bad Zwischenahn, Germany, 31 August-5 September, 1995 by B Kollmeier(
)1
edition published
in
1996
in
English
and held by
0 WorldCat member
libraries
worldwide
Recent advances in psychoacoustics and speech research have an important impact on our understanding of hearing impairment
and the concepts of compensating hearing problems with modern hearing instruments. This proceedings of the summer school and
symposium give an introduction into the latest developments in this interdisciplinary area. Tutorials of leading international
scientists as well as more focused contributions of active researchers provide an excellent overview and a documentation of
the "state of the art". The book is of interest for everybody involved in hearing research, audiology

Development and objective perceptual quality assessment of monaural and binaural noise reduction schemes for hearing aids by Thomas Rohdenburg(
)1
edition published
in
2008
in
English
and held by
0 WorldCat member
libraries
worldwide
People with hearing impairment have great difficulties communicating in noisy and reverberant environments. They usually require
a higher signal-to-noise ratio (SNR) to achieve the same listening performance as normal hearing people. The current dissertation
addresses this difficulty with the development of novel binaural noise reduction schemes for hearing aids and their evaluation
under realistic conditions. Particular consideration is given to influences of head shadow and diffraction, head movements,
microphone properties, and the preservation of binaural information. The algorithms are evaluated using novel objective measures
based on recent knowledge of the auditory system and by subjective listening tests. From the results it is expected that both,
the algorithms and objective assessment methods, will prove to be beneficial for human communication in noise in the future.
<engl.>